JP7294440B2 - In vivo tube introduction determination device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an in-vivo tube introduction determination device.

A technique for inserting a tube into a living body is conventionally known. Such techniques are described, for example, in Kazuya Ohmura, Daisuke Ono, Takahisa Kawashima, Takayuki Kato, Yuriko Fujita, Yusuke Itagaki, Yukiko Watanabe, Noboru Ishii, Complications during feeding tube insertion: A case of esophageal perforation, Japan It is disclosed in Journal of Intensive Care Medicine, 2011, Vol. 18, No. 3, pp. 401-404 (hereinafter simply referred to as "complications during feeding tube insertion: an example of esophageal perforation").

In the above "Complications when inserting a feeding tube: an example of esophageal perforation", a nasogastric feeding tube is inserted into the patient, and the insertion status of the nasogastric feeding tube is confirmed by simple chest X-ray examination and auscultation. is disclosed.

Kazuya Omura, Daisuke Ono, Takahisa Kawashima, Takayuki Kato, Yuriko Fujita, Yusuke Itagaki, Yukiko Watanabe, Noboru Ishii, "Complications during feeding tube insertion: A case of esophageal perforation", Japanese Journal of Intensive Care Medicine, 2011 Vol.18 No.3 p.401-404

However, as described above in "Complications during insertion of a feeding tube: An example of esophageal perforation", it is necessary to perform X-ray imaging when performing a simple chest X-ray examination, so it is necessary to check the insertion status of the tube. Verification is not easy. In addition, when auscultation is performed, gastric bubble sounds do not occur unless the tip of the tube is in contact with the gastric juice, so it is not possible to reliably confirm the insertion state of the tube. Moreover, in any of the above-described methods, it is not possible to check the insertion state of the tube while the tube is being inserted into the living body. For these reasons, it is desired to easily and reliably confirm the insertion state of the tube, and to confirm the insertion state of the tube while the tube is being inserted into the living body.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-described problems, and an object of the present invention is to make it possible to easily and reliably confirm the insertion state of a tube, and to prevent the insertion of a tube into a living body. An object of the present invention is to provide an in-vivo tube introduction determination device capable of confirming the insertion state of a tube during insertion.

In order to achieve the above object, in one aspect of the present invention, an in-vivo tube introduction determination device includes a gas detection section and a notification section, wherein the gas detection section has a first end and a second end. and the first end is connected to the second end of a tube inserted into the living body , the concentration of the first gas component having a concentration difference between the respiratory tract, the stomach and the esophagus, and the concentration between the stomach and the esophagus The notification unit is configured to detect the concentration of the second gas component having a concentration difference in the tube based on the concentration of the first gas component and the concentration of the second gas component detected by the gas detection unit The information is notified in a distinguishable manner whether the first end of is located in the respiratory tract, the stomach, or the esophagus.

According to the present invention, with the configuration as described above, the information based on the output of the concentration of the first gas component and the information based on the output of the concentration of the second gas component can be notified to the user by the notification unit. can. As a result, the user can confirm whether the tube is located in the respiratory tract of the living body or in a position other than the respiratory tract based on the information based on the notified output of the concentration of the first gas component. Whether the tube is located in the stomach or the esophagus can be determined based on the information based on the second gas component concentration output. As a result, the insertion state of the tube can be easily and reliably confirmed, and the insertion state of the tube can be confirmed while the tube is being inserted into the living body.

1 is a schematic diagram showing the overall configuration of an in-vivo tube introduction determination device; FIG. FIG. 3 is a block diagram showing a control configuration of the in-vivo tube introduction determination device; FIG. 3 is a schematic diagram showing attachment of a tube to the in-vivo tube introduction determination device; FIG. 4 is a schematic diagram showing the flow of gas from inside the living body to the in-vivo tube introduction determination device. (A) is a diagram for explaining a case where the tip of the tube is positioned in the respiratory tract. (B) is a schematic diagram showing a display example of the in-vivo tube introduction determination device in the case of (A). (A) is a diagram for explaining a case where the tip of the tube is positioned in the esophagus. (B) is a schematic diagram showing a display example of the in-vivo tube introduction determination device in the case of (A). (A) is a diagram for explaining a case where the tip of the tube is positioned in the stomach. (B) is a schematic diagram showing a display example of the in-vivo tube introduction determination device in the case of (A).

Embodiments embodying the present invention will be described below with reference to the drawings.

An in-vivo tube introduction determining device 100 according to one embodiment will be described with reference to FIGS. 1 and 2. FIG.

(In vivo tube introduction determination device)
As shown in FIG. 1 , the in-vivo tube introduction determination device 100 is a device for determining the introduction state (insertion state) of a tube 300 inside a living body 200 .

The tube 300 is a tube that is inserted into the stomach of a living body 200, which is a human body, through the nose or mouth. Tube 300 may be, for example, a feeding tube for injecting an infusion such as a nutrient into the stomach of living body 200, a drainage tube for discharging contents such as body fluid from the stomach of living body 200, or the like. Tube 300 has a first end 301 and a second end 302 . The first end 301 is inserted into the living body 200 through the nose or mouth and left in the stomach. The second end 302 can be placed outside the living body 200 and connected to a bag such as a nutrition bag, a drainage bag, or the like. In this embodiment, the second end 302 is attached to the in-vivo tube introduction determination device 100 when the tube 300 is inserted into the living body 200 .

As shown in FIGS. 1 and 2 , the in-vivo tube introduction determination device 100 includes a gas detection unit 10 , a display unit 20 , a pump 30 , a storage unit 40 and a control unit 50 . The gas detection unit 10, at least part of the display unit 20, the pump 30, the storage unit 40, and the control unit 50 are provided in a housing 60 that constitutes the exterior of the in-vivo tube introduction determination device 100. . In addition, the display unit 20 is an example of the “notification unit” in the scope of claims.

The gas detection unit 10 is configured to be able to detect the concentration of gas components in the living body 200 . Gas detector 10 is connected to second end 302 of tube 300 . The gas detection unit 10 is configured to be able to detect the concentration of carbon dioxide, which is the first gas component, and the concentration of hydrogen, which is the second gas component having a concentration difference between the stomach and the esophagus. Specifically, the gas detection unit 10 includes a first gas detection unit 11 capable of detecting the concentration of a first gas component (carbon dioxide) and a second gas detection unit 11 capable of detecting the concentration of a second gas component (hydrogen). section 12; The first gas detection unit 11 and the second gas detection unit 12 are sensors provided independently of each other. Note that the first gas detection unit 11 may be any sensor capable of detecting at least the first gas component. That is, the first gas detection unit 11 may be a sensor capable of detecting only the first gas component (carbon dioxide), or may be a sensor capable of detecting a plurality of gas components including the first gas component. good. Similarly, the second gas detector 12 may be any sensor capable of detecting at least the second gas component. That is, the second gas detection unit 12 may be a sensor that detects only the second gas component (hydrogen), or may be a sensor that detects a plurality of gas components including the second gas component.

The display unit 20 is configured to notify information based on the output of the gas detection unit 10 . Specifically, the display unit 20 includes a first display unit 21 that notifies information based on the output of the gas detection unit 10 by screen display (image), and a second display unit 21 that notifies information based on the output of the gas detection unit 10 by light. 2 display portion 22 . The first display unit 21 includes, for example, a monitor, and is configured to display and notify information such as numerical values and graphs. The second display unit 22 includes, for example, a light source unit such as an LED (light emitting diode), and is configured to notify information according to the lighting state of the light source unit. The second display section 22 has two lighting sections, a first lighting section 22a and a second lighting section 22b. The details of notification of information based on the output of the gas detection unit 10 will be described later.

The pump 30 is configured to suck the gas inside the living body 200 from the first end 301 of the tube 300 and introduce the sucked gas inside the living body 200 to the gas detection section 10 . Although the pump 30 is not particularly limited, for example, an electric pump such as a pump using a fan or a tube pump can be used.

The storage unit 40 includes a recording medium such as a volatile memory and a nonvolatile memory, and is configured to be able to store information. The storage unit 40 stores a program 41 for operating the in-vivo tube introduction determination device.

The control unit 50 includes a processor such as a CPU, and is configured to execute the program 41 . Thereby, the control unit 50 is configured to operate each unit of the device for determining whether an in-vivo tube has been introduced. Further, the control unit 50 is configured to sequentially read the outputs of the first gas detection unit 11 and the second gas detection unit 12 of the gas detection unit 10 and store them in the storage unit 40 along with the time. Further, the control unit 50 is configured to perform control to display the processed data obtained by reading out and processing the data stored in the storage unit 40 on the first display unit 21 of the display unit 20 .

(Installation of tube)
As shown in FIG. 3, the housing 60 is provided with an inlet 61 to which the second end 302 of the tube 300 is connected. The introduction port 61 is a through hole that connects the inside and outside of the housing 60 . Gas inside the living body 200 is introduced into the housing 60 through the introduction port 61 . A joint member 70 is provided between the second end 302 of the tube 300 and the introduction port 61 . A second end 302 of the tube 300 is attached to the inlet 61 via a joint member 70 . In addition, the joint member 70 is provided with a filter 80 for preventing infectious diseases. Filter 80 may be, for example, a filter capable of trapping pathogens, such as a HEPA (High Efficiency Particulate Air Filter) filter. The joint member 70 and filter 80 are disposable and replaced after each use. The filter 80 is arranged near the inlet 61 .

(Gas flow from the living body)
As shown in FIG. 4 , in the housing 60 , the pump 30 and the first gas detection unit 11 and the second gas detection unit 12 of the gas detection unit 10 are connected to each other via a branch flow path 90 . . The branch flow path 90 has a common end 91 connected to the output side of the pump 30 , a first branch end 92 connected to the first gas detection section 11 of the gas detection section 10 , and a second gas detection section 11 of the gas detection section 10 . and a second branch end 93 connected to the detector 12 . After being introduced from the first end 301 of the tube 300 , the gas inside the living body 200 flows through the tube 300 , the second end 302 of the tube 300 , the joint member 70 , the inlet 61 , and the branch channel 90 in this order. It is introduced into the first gas detection unit 11 or the second gas detection unit 12 . When passing through the joint member 70 , pathogenic bacteria are collected from the gas inside the living body 200 by the filter 80 provided in the joint member 70 .

In addition, since there is a risk of sucking gastric juice or the like when the pump 30 sucks the gas inside the living body 200, there is a risk of sucking the gas inside the living body 200, such as the tube 300, the joint member 70, the pump 30, and the branch channel 90. Alternatively, a gas-permeable membrane that is permeable to gas but not liquid may be provided. In this case, the filter 80 may be configured to function as a gas-permeable membrane, or a gas-permeable membrane may be provided separately from the filter 80 .

(Notification of information based on the output of the gas detector)
As shown in FIGS. 4 to 6, the first display section 21 of the display section 20 displays the time change 23 of the value corresponding to the concentration of the first gas component (carbon dioxide), the value corresponding to the concentration of the first gas component 24 and a value 25 corresponding to the concentration of the second gaseous component (hydrogen). Specifically, the first display section 21 of the display section 20 is configured to display the time change 23 of the value corresponding to the concentration of the first gas component in a time-series graph. The first display section 21 of the display section 20 is configured to display a value 24 corresponding to the concentration of the first gas component and a value 25 corresponding to the concentration of the second gas component in real time.

The second gas component (hydrogen) is a gas component generated by the intestinal flora and has different concentrations in the stomach and esophagus. Specifically, the concentration of the second gas component in the stomach is higher than the concentration of the second gas component in the esophagus. This is because the lower esophageal sphincter and cardia existing between the stomach and the esophagus of the living body 200 impede the flow of gas from the stomach to the esophagus. Thus, by visually confirming the value 25 corresponding to the concentration of the second gaseous component, the user can determine whether the first end 301 of the tube 300 is located in the stomach or the esophagus. . However, since hydrogen, which is the second gaseous component, is also generated in the lungs, displaying the value 25 corresponding to the concentration of the second gaseous component does not indicate that the first end 301 of the tube 300 is located in the lungs (airway). It may be determined to be located in the stomach even if

Therefore, along with the value 25 corresponding to the concentration of the second gas component, the change over time 23 of the value corresponding to the concentration of the first gas component (carbon dioxide) is displayed. When the first end 301 of the tube 300 is located in the lung (airway), the concentration of the first gas component periodically changes over time so as to correspond to the respiratory cycle of the living body 200. Therefore, the concentration of the first gas component It can be determined whether the first end 301 of the tube 300 is located in the lung (airway) or outside the airway by checking the time variation 23 of the value corresponding to .

At this time, the control unit 50 reads the output of the first gas detection unit 11 of the gas detection unit 10 from the storage unit 40 for the most recent predetermined time period, and reads the output of the first gas component (dioxide) for the latest predetermined time period. The first display section 21 of the display section 20 is controlled so as to display the time change 23 of the value corresponding to the concentration of carbon) in a time-series line graph. The predetermined time read out from the storage unit 40 is longer than one respiratory cycle of the living body 200, and is predetermined by an experiment or the like. Note that the predetermined time preferably includes a plurality of respiratory cycles of the living body 200 from the viewpoint of reliably determining whether the tube 300 has been erroneously inserted into the respiratory tract of the living body 200 . The predetermined time can be, for example, approximately 30 seconds.

Further, the control unit 50 reads out the latest output of the first gas detection unit 11 of the gas detection unit 10 and the latest output of the second gas detection unit 12 of the gas detection unit 10 from the storage unit 40 and reads out the latest output. A value 24 corresponding to the concentration of the first gas component (carbon dioxide) and a value 25 corresponding to the latest concentration of the second gas component (hydrogen) are controlled on the first display unit 21 of the display unit 20 .

In addition, in this embodiment, the controller 50 is configured to automatically determine the insertion state of the tube 300 . Specifically, based on the concentration of the first gas component (carbon dioxide), the control unit 50 determines whether the first end 301 of the tube 300 is located in the respiratory tract of the living body 200 or in a position other than the respiratory tract. It is configured to perform control to More specifically, the control unit 50 performs control to determine that the first end 301 of the tube 300 is positioned in the respiratory tract of the living body 200 when periodic fluctuations are observed in the concentration of the first gas component. . Further, the control unit 50 performs control to determine that the first end 301 of the tube 300 is located at a position other than the respiratory tract of the living body 200 when the concentration of the first gas component does not change periodically. . Whether or not the concentration of the first gas component shows periodic fluctuations can be determined by Fourier transforming the output of the first gas detection section 11 of the gas detection section 10 .

Further, when it is determined that the first end 301 of the tube 300 is located at a position other than the respiratory tract of the living body 200, the control unit 50 controls the position of the tube 300 based on the concentration of the second gas component (hydrogen). The control is configured to determine whether the first end 301 is located in the stomach or the esophagus. At this time, for example, the control unit 50 controls the comparison between the concentration of the second gas component and the threshold value. The control unit 50 performs control to determine that the first end 301 of the tube 300 is located in the esophagus when the concentration of the second gas component is equal to or less than the threshold value. In addition, when the concentration of the second gas component is greater than the threshold value, the control unit 50 performs control to determine that the first end 301 of the tube 300 is located in the stomach. The threshold value may be determined and stored based on the output of the first gas detection unit 11 when it is confirmed that the first end 301 of the tube 300 is normally positioned in the stomach. Alternatively, a standard value may be stored.

Note that the controller 50 determines whether the first end 301 of the tube 300 is in the stomach or the esophagus, not based on the absolute value of the concentration of the second gas component, but based on the concentration change (concentration drop) of the second gas component. You may perform control which determines whether it is located in. The control unit 50 performs control to determine that the first end 301 of the tube 300 is located in the stomach when the concentration of the second gas component suddenly increases. Further, the control unit 50 performs control to determine that the first end 301 of the tube 300 is located in the esophagus when the concentration of the second gas component does not suddenly increase. As a result, accurate determination can be performed even when the concentration of the second gas component varies greatly among individuals, and even when the difference in the concentration of the second gas component depending on the physical condition of an individual is large.

The display unit 20 displays the determination result as to whether the first end 301 of the tube 300 is positioned in the respiratory tract or a position other than the respiratory tract of the living body 200, and whether the first end 301 of the tube 300 is positioned in the stomach or the esophagus. It is configured to notify the determination result of whether or not Specifically, the first display unit 21 of the display unit 20 is configured to notify the determination result by screen display. Notification by screen display is not particularly limited, but may be, for example, notification by character display such as "NG" or "OK". Also, the notification by screen display may be notification by color display of the displayed values (values 24 and 25), for example. In this case, for example, if it is determined that the first end 301 of the tube 300 is located in the respiratory tract, the value 24 corresponding to the concentration of the first gaseous component (carbon dioxide) is indicated by an unusual color. It can be displayed and notified. Similarly, when it is determined that the first end 301 of the tube 300 is located in the esophagus, the value 25 corresponding to the concentration of the second gaseous component (hydrogen) is displayed in a different color than usual. can be notified. Similarly, if it is determined that the first end 301 of the tube 300 is located in the stomach, then a value 24 corresponding to the concentration of the first gaseous component and a value 25 corresponding to the concentration of the second gaseous component can be displayed and notified in the same color as usual.

Further, the second display section 22 of the display section 20 is configured to notify the determination result by the lighting state. Specifically, the second display unit 22 determines that the first end 301 of the tube 300 is located in the respiratory tract and that the first end 301 of the tube 300 is located in the esophagus. In this case, only the second lighting part 22b, which indicates that the first end 301 of the tube 300 is not located in the stomach, is lit up, out of the first lighting part 22a and the second lighting part 22b. It is In addition, when it is determined that the first end 301 of the tube 300 is located in the stomach, the second display unit 22 switches between the first lighting unit 22a and the second lighting unit 22b. It is configured to light only the first lighting portion 22a indicating that the first end 301 of the tube 300 is positioned in the stomach.

(Effect of this embodiment)
The following effects can be obtained in this embodiment.

In this embodiment, as described above, the in-vivo tube introduction determination device 100 is a second end of the tube 300 having the first end 301 and the second end 302 and the first end 301 being inserted into the living body 200 . It is configured to include a gas detection unit 10 connected to the end 302 and a display unit 20 for notifying information based on the output of the gas detection unit 10 . The gas detection unit 10 is configured to be capable of detecting the concentration of the first gas component, which is carbon dioxide, and the concentration of the second gas component having a concentration difference between the stomach and the esophagus. Accordingly, the display unit 20 can notify the user of the information based on the output of the concentration of the first gas component and the information based on the output of the concentration of the second gas component. As a result, the user can confirm whether the tube 300 is located in the respiratory tract of the living body 200 or in a position other than the respiratory tract based on the information based on the notified output of the concentration of the first gas component. , it can be confirmed whether the tube 300 is located in the stomach or the esophagus based on the information based on the notified output of the concentration of the second gas component. As a result, the insertion state of the tube 300 can be easily and reliably confirmed, and the insertion state of the tube 300 can be confirmed while the tube 300 is being inserted into the living body 200 .

Further, in the present embodiment, as described above, the gas detection unit 10 is divided into the first gas detection unit 11 capable of detecting the concentration of the first gas component and the second gas detection unit capable of detecting the concentration of the second gas component. 12. As a result, the concentration of the first gas component and the concentration of the second gas component can be detected by separate gas detection units (that is, the first gas detection unit 11 and the second gas detection unit 12). Each of the concentration of the component and the concentration of the second gas component can be detected with high accuracy.

Moreover, in this embodiment, as described above, the first gas component is carbon dioxide. As a result, since carbon dioxide, which has a lower concentration in the air than oxygen, is used as the first gas component, it is possible to easily detect changes in the concentration of the first gas component compared to the case where oxygen is used as the first gas component. can. As a result, it is possible to easily confirm whether the tube 300 is positioned in the respiratory tract of the living body 200 or in a position other than the respiratory tract.

Moreover, in this embodiment, as described above, the second gas component is hydrogen. As a result, among the second gas components (such as methane) having a concentration difference between the stomach and the esophagus, hydrogen having a large difference between the concentration in the air and the concentration in the stomach is used as the second gas component. Even if the living body 200 swallows air, the change in concentration of the second gas component can be detected more easily than when methane or the like is used as the second gas component. As a result, it can be easily confirmed whether the tube 300 is positioned in the stomach or the esophagus of the living body 200 . As an example, when comparing hydrogen and methane, the concentration of hydrogen is about 0.5 ppm in the air and the concentration of methane is about 1.8 ppm, whereas the concentration of hydrogen in the stomach is about 0.5 ppm. is about 5-10 ppm and the concentration of methane is about 2-3 ppm.

Further, in this embodiment, as described above, the display unit 20 is configured to display the time change 23 of the value corresponding to the concentration of the first gas component and the value 25 corresponding to the concentration of the second gas component. Configure. Accordingly, the user can confirm whether or not the concentration of the first gas component periodically fluctuates based on the time change 23 of the value corresponding to the concentration of the first gas component displayed on the display unit 20. Therefore, whether the tube 300 is located in the respiratory tract or in a position other than the respiratory tract of the living body 200 can be easily confirmed based on whether there is a periodic variation in the concentration of the first gas component. can do. In addition, the user can confirm the magnitude of the concentration of the second gas component based on the value 25 corresponding to the concentration of the second gas component displayed on the display unit 20. Based on the size, it can be easily confirmed whether the tube 300 is positioned in the stomach or the esophagus of the living body 200 .

Further, in this embodiment, as described above, the display unit 20 is configured to display the time-series graph 23 of the value corresponding to the concentration of the first gas component. As a result, the user can see that there is a periodic variation in the concentration of the first gas component based on the time change 23 of the value corresponding to the concentration of the first gas component displayed in the time-series graph on the display unit 20. It is possible to easily and reliably confirm whether or not

Further, in this embodiment, as described above, the display unit 20 is configured to display the value 25 corresponding to the concentration of the second gas component in real time. Accordingly, the user can easily confirm the magnitude of the concentration of the second gas component in real time based on the value 25 corresponding to the concentration of the second gas component displayed on the display unit 20 in real time.

In addition, in the present embodiment, as described above, the control unit 50 is controlled based on the concentration of the first gas component to determine whether the first end 301 of the tube 300 is positioned in the respiratory tract of the living body 200 or in a position other than the respiratory tract. It is configured to perform control to determine whether or not As a result, the controller 50 can automatically determine whether the first end 301 of the tube 300 is positioned in the respiratory tract of the living body 200 or in a position other than the respiratory tract. It is possible to reduce the user's trouble of determining whether the living body 200 is positioned in the respiratory tract or in a position other than the respiratory tract.

Further, in the present embodiment, as described above, when it is determined that the first end 301 of the tube 300 is located at a position other than the respiratory tract of the living body 200, the control unit 50 controls the concentration of the second gas component. , the control is configured to determine whether the first end 301 of the tube 300 is located in the stomach or the esophagus. As a result, whether the first end 301 of the tube 300 is positioned in the stomach or the esophagus can be automatically determined by the controller 50. It is possible to reduce the user's trouble of determining whether it is located. Also, when it is determined that the first end 301 of the tube 300 is located at a position other than the respiratory tract of the living body 200, it is determined whether the first end 301 of the tube 300 is located in the stomach or the esophagus. Therefore, it can be determined more reliably whether the first end 301 of the tube 300 is located in the stomach or the esophagus.

Further, in the present embodiment, as described above, the display unit 20 displays the determination result as to whether the first end 301 of the tube 300 is positioned in the respiratory tract or the position other than the respiratory tract of the living body 200, and the position of the tube 300. It is configured to notify the result of determination whether the first end 301 is located in the stomach or the esophagus. This allows the user to determine whether the first end 301 of the tube 300 is positioned in the respiratory tract or a position other than the respiratory tract of the living body 200 and whether the first end 301 of the tube 300 is located in the stomach or the esophagus. Since it is possible to easily confirm the determination result as to whether the tube 300 is positioned, it is possible to easily confirm the inserted state of the tube 300 .

In addition, in the present embodiment, as described above, the in-vivo tube introduction determination device 100 sucks the gas inside the living body 200 from the first end 301 of the tube 300, and the sucked gas inside the living body 200 is detected by the gas detection unit. It is configured to include a pump 30 for introducing into 10 . As a result, the gas in the living body 200 can be quickly and reliably introduced to the gas detection unit 10 by the action of the pump 30, so that the gas detection unit 10 can detect the concentration of the first gas component and detect the concentration of the second gas component. can be detected quickly and reliably.

Further, in the present embodiment, as described above, the in-vivo tube introduction determination device 100 is configured to include the filter 80 for preventing infectious diseases. As a result, even when the in-vivo tube introduction determination device 100 is reused, it is possible to suppress the onset of infectious diseases through the in-vivo tube introduction determination device 100 .

Further, in the present embodiment, as described above, the in-vivo tube introduction determination device 100 is configured to include the gas introduction port 61 in the living body 200 to which the second end 302 of the tube 300 is connected. Filter 80 is also configured to be disposable and positioned near inlet 61 . As a result, the filter 80 can be disposable, so that the onset of infectious disease through the in-vivo tube introduction determining device 100 can be suppressed more reliably than when the filter 80 is reused. Also, by arranging the filter 80 near the inlet 61, the disposable filter 80 can be easily attached and detached.

[Modification]
It should be noted that the embodiments disclosed this time should be considered as examples and not restrictive in all respects. The scope of the present invention is indicated by the scope of the claims rather than the above-described description of the embodiments, and includes all modifications (modifications) within the meaning and scope equivalent to the scope of the claims.

For example, in the above-described embodiment, the gas detection section includes the first gas detection section and the second gas detection section, but the present invention is not limited to this. In the present invention, the gas detection section may be composed of a single gas detection section capable of detecting both the first gas component and the second gas component.

Moreover, although the first gas component is carbon dioxide in the above embodiment, the present invention is not limited to this. In the present invention, the first gas component may be oxygen.

Moreover, although the second gas component is hydrogen in the above embodiment, the present invention is not limited to this. In the present invention, the second gaseous component may be a gaseous component such as methane having a concentration difference between the stomach and the esophagus. The second gas component may be any gas component generated due to the presence of gastric juice or intestinal flora.

Further, in the above-described embodiment, an example in which the display section (notification section) includes the first display section and the second display section is shown, but the present invention is not limited to this. In the present invention, the notification section may include only the first display section out of the first display section and the second display section when the determination is not performed by the control section. Further, in the present invention, when the determination is performed by the control section, the notification section may include only the second display section out of the first display section and the second display section. Further, in this case, the notification section may be configured to notify information based on the output of the gas detection section by means of sound, vibration, or the like, instead of including the second display section.

Further, in the above embodiment, the display unit displays both the time change of the value corresponding to the concentration of the first gas component and the value corresponding to the concentration of the first gas component with respect to the first gas component. Although shown, the invention is not so limited. In the present invention, for the first gas component, the display unit displays only one of the time change of the value corresponding to the concentration of the first gas component and the value corresponding to the concentration of the first gas component. may However, from the viewpoint of making an accurate determination, it is preferable that the display section displays the time change of the value corresponding to the concentration of the first gas component.

Further, in the above-described embodiment, an example in which the control unit automatically determines the insertion state of the tube has been described, but the present invention is not limited to this. In the present invention, the control unit does not necessarily have to automatically determine the insertion state of the tube. In this case, the user may determine the insertion state of the tube based on the information based on the output of the gas detection section displayed on the display section.

Further, in the above-described embodiment, an example in which a pump is provided in the in-vivo tube introduction determination device has been described, but the present invention is not limited to this. In the present invention, it is not always necessary to provide a pump when using a highly sensitive sensor capable of ensuring sufficient detection accuracy as the gas detection section.

Further, in the above-described embodiment, an example in which the in-vivo tube introduction determination device is provided with a filter has been described, but the present invention is not limited to this. In the present invention, it is not always necessary to provide a filter when the risk of infection is small.

In addition, in the above-described embodiment, an example in which a joint member is provided in the intra-vivo tube introduction determination device has been described, but the present invention is not limited to this. In the present invention, it is not always necessary to provide a joint member. In this case, the second end of the tube may be directly connected to the introduction port of the in-vivo tube introduction determination device.

Moreover, in the above-described embodiment, an example in which a filter is provided on the joint member has been shown, but the present invention is not limited to this. In the present invention, a disposable filter may be detachably provided at the introduction port of the in-vivo tube introduction determining device.

Further, in the above-described embodiment, an example in which the first gas detection section and the second gas detection section are provided in the branch flow path has been described, but the present invention is not limited to this. In the present invention, the first gas detection section and the second gas detection section may be provided in a series flow path that does not branch. In this case, for example, gas in the living body passes through the first gas detection section and then the second gas detection section in that order.

[Aspect]
It will be appreciated by those skilled in the art that the exemplary embodiments described above are specific examples of the following aspects.

(Item 1)
a gas detection unit having a first end and a second end, the first end being connected to the second end of a tube inserted into a living body;
a notification unit that notifies information based on the output of the gas detection unit;
The gas detection unit is configured to detect the concentration of a first gas component, which is carbon dioxide or oxygen, and the concentration of a second gas component having a concentration difference between the stomach and the esophagus. Device.

(Item 2)
Item 2. The device according to item 1, wherein the gas detection unit includes a first gas detection unit capable of detecting the concentration of the first gas component and a second gas detection unit capable of detecting the concentration of the second gas component. Body tube introduction determination device.

(Item 3)
The in-vivo tube introduction determination device according to item 1 or 2, wherein the first gas component is carbon dioxide.

(Item 4)
The in-vivo tube introduction determination device according to any one of items 1 to 3, wherein the second gas component is hydrogen.

(Item 5)
The notification unit includes a display unit,
Any one of items 1 to 4, wherein the display unit is configured to display a time change of a value corresponding to the concentration of the first gas component and a value corresponding to the concentration of the second gas component. 2. The in-vivo tube introduction determination device according to item 1.

(Item 6)
Item 6. The in-vivo tube introduction determination device according to item 5, wherein the display unit is configured to display a time-series graph of the change in the value corresponding to the concentration of the first gas component over time.

(Item 7)
7. The in-vivo tube introduction determination device according to item 5 or 6, wherein the display unit is configured to display a value corresponding to the concentration of the second gas component in real time.

(Item 8)
further comprising a control unit,
The control unit is configured to perform control to determine whether the first end of the tube is positioned in the respiratory tract of the living body or in a position other than the respiratory tract based on the concentration of the first gas component. The in-vivo tube introduction determination device according to any one of items 1 to 7.

(Item 9)
The controller controls the first end of the tube based on the concentration of the second gas component when it is determined that the first end of the tube is located at a position other than the respiratory tract of the living body. 9. The in-vivo tube introduction determining device according to item 8, configured to perform control to determine whether the is located in the stomach or the esophagus.

(Item 10)
The notification unit receives a determination result as to whether the first end of the tube is positioned in the respiratory tract of the living body or in a position other than the respiratory tract, and whether the first end of the tube is positioned in the stomach or the esophagus. Item 10. The in-vivo tube introduction determination device according to item 9, configured to notify a determination result as to whether the in-vivo tube introduction is performed.

(Item 11)
11. The apparatus according to any one of items 1 to 10, further comprising a pump for sucking gas inside the living body from the first end of the tube and introducing the sucked gas inside the living body into the gas detection unit. In vivo tube introduction determination device.

(Item 12)
The in-vivo tube introduction determination device according to any one of items 1 to 11, further comprising a filter for preventing infectious diseases.

(Item 13)
further comprising an in vivo gas introduction port to which the second end of the tube is connected;
13. The in-vivo tube introduction determination device according to item 12, wherein the filter is disposable and arranged near the introduction port.

REFERENCE SIGNS LIST 10 gas detection unit 11 first gas detection unit 12 second gas detection unit 20 display unit (notification unit)
30 pump 50 controller 61 inlet 80 filter 200 living body 300 tube 301 first end 302 second end

Claims (14)

a gas detector;
a notification unit;
The gas detection unit is
having a first end and a second end, the first end being connected to the second end of a tube to be inserted into a living body ;
The concentration of a first gas component having a concentration difference between the respiratory tract and the stomach and esophagus and the concentration of a second gas component having a concentration difference between the stomach and the esophagus are detectable ,
The notification unit
whether the first end of the tube is located in the respiratory tract or in the stomach, based on the concentration of the first gas component and the concentration of the second gas component detected by the gas detection unit; Alternatively, an in-vivo tube introduction determination device that notifies information in a distinguishable manner as to whether the device is located in the esophagus . 2. The gas detection unit according to claim 1, wherein the gas detection unit includes a first gas detection unit capable of detecting the concentration of the first gas component and a second gas detection unit capable of detecting the concentration of the second gas component. In vivo tube introduction determination device. The in-vivo tube introduction determination device according to claim 1, wherein the first gas component is carbon dioxide or oxygen. The in-vivo tube introduction determination device according to claim 3 , wherein the first gas component is carbon dioxide. The in-vivo tube introduction determination device according to claim 1, wherein the second gas component is hydrogen. The notification unit includes a display unit,
2. The production system according to claim 1, wherein the display unit is configured to display a time change of a value corresponding to the concentration of the first gas component and a value corresponding to the concentration of the second gas component. Body tube introduction determination device. 7. The in-vivo tube introduction determination device according to claim 6 , wherein said display unit is configured to display a time-series graph of the change in the value corresponding to the concentration of said first gas component over time. 7. The in-vivo tube introduction determination device according to claim 6 , wherein said display unit is configured to display a value corresponding to the concentration of said second gas component in real time. further comprising a control unit,
The control unit is configured to perform control to determine whether the first end of the tube is positioned in the respiratory tract of the living body or in a position other than the respiratory tract based on the concentration of the first gas component. The in-vivo tube introduction determination device according to claim 1, wherein: The controller controls the first end of the tube based on the concentration of the second gas component when it is determined that the first end of the tube is located at a position other than the respiratory tract of the living body. 10. The in-vivo tube introduction determination device according to claim 9 , configured to perform control to determine whether the is located in the stomach or the esophagus. The notification unit receives a determination result as to whether the first end of the tube is positioned in the respiratory tract of the living body or in a position other than the respiratory tract, and whether the first end of the tube is positioned in the stomach or the esophagus. 11. The in-vivo tube introduction determination device according to claim 10 , which is configured to notify the result of determination as to whether or not the tube has been inserted. 2. The in-vivo tube introduction determination device according to claim 1 , further comprising a pump for sucking gas inside the living body from said first end of said tube and introducing the sucked inside gas into said gas detection unit. . The in-vivo tube introduction determination device according to claim 1, further comprising a filter for preventing infections. further comprising an in vivo gas introduction port to which the second end of the tube is connected;
14. The in-vivo tube introduction determination device according to claim 13 , wherein said filter is disposable and arranged near said introduction port.

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